False crown ?

[Harter66]

I aquired an sks and upon slugging it I found a bore that should be very happy with cast boolits. As with all things too good it is. The muzzle is belled to about .320 x.312 in the last 1/4 inch from .314x304. I'd like to back bore about a 1/2 inch how far over bore should I go ?

[Trailblazer]

I counterbored the muzzle on an 1895 Winchester in 30US. I just cut until the grooves were cleaned up which was about .320". It worked great. It became an extremely accurate rifle.

[Harter66]

Thanks.

When you bored , did you go .320 deep or accross?

[leftiye]

Diameter. .330 is still good. Go as deep as the cleaning rod wear still exists.

[Harter66]

Thanks again. Hoping to get out and empty some factory brass so I can get to making it shoot strait. The bore is huge , good thing I shoot cast boolits big enough to fill bores like this one.

[Trailblazer]

I went .320" diameter. I think I only went .100" deep. Just enough to clean up the lands.

[Harter66]

I went about .250 deep at .325 . Due to availible tooling. It cleaned up nice.